How does Random Forest improve upon a single Decision Tree?

Practice Questions

Q1
How does Random Forest improve upon a single Decision Tree?
  1. By using a single tree with more depth.
  2. By averaging the predictions of multiple trees.
  3. By using only the most important features.
  4. By increasing the size of the training dataset.

Questions & Step-by-Step Solutions

How does Random Forest improve upon a single Decision Tree?
  • Step 1: Understand that a Decision Tree is a model that makes predictions based on a series of questions about the data.
  • Step 2: Realize that a single Decision Tree can sometimes make mistakes, especially if it is too complex or too simple.
  • Step 3: Learn that Random Forest is a method that uses many Decision Trees instead of just one.
  • Step 4: Know that each tree in the Random Forest makes its own prediction based on the data.
  • Step 5: Understand that Random Forest combines the predictions from all the trees, usually by averaging them.
  • Step 6: Recognize that by averaging the predictions, Random Forest reduces the chance of making errors that a single tree might make.
  • Step 7: Conclude that this process helps improve the overall accuracy of the predictions and reduces overfitting.
  • Ensemble Learning – Random Forest is an ensemble method that combines multiple decision trees to improve predictive performance.
  • Overfitting – A single decision tree can overfit the training data, while Random Forest mitigates this by averaging predictions from multiple trees.
  • Averaging Predictions – Random Forest enhances accuracy by averaging the outputs of various decision trees, leading to more robust predictions.
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